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10
Disposal of Sewage.
Situation of the Works.—The Sewage Works are situated
on the South Side of the District (in Wood Green Parish), and
within 100 yards of a small brook, into which the effluent flows.
The original works were completed at the end of 1886, from
designs furnished by Mr. Baldwin Latham, M.Inst C.E., and
were executed under his direction.
The working of the tanks and original filters has been
altered and improved, and three Contact Beds have been
constructed under the supervision of Mr. E. J. Reynolds,
Assoc. M. Inst.C.E. Further additions are contemplated as
mentioned below.
The method of treatment is as follows:—
The Sewage, which enters the works by gravitation, is first
passed through a revolving screen, after which a solution of
Buxton lime, equal to four grains per gallon, is added, and the
whole is thoroughly mixed. It then receives alumino-ferric to
the extent of one grain per gallon, and is again well mixed by
passing through a salmon ladder, and in this condition it flows
into settling tanks, of which, there are four, each having a
capacity of 70,000 gallons.
These tanks are divided by concrete walls, on which is an
open channel divided by sluice doors, so that either one, two,
three or four tanks can be worked at a time or alternately, as
required. The overflow from the tanks first passes out of the
tanks into an open channel, then on to first Contact Beds, and
through the filter or second Bacteria Beds into an effluent
chamber, and thence into the brook referred to above.
During the past year employment for local labour was found
by commencing the construction of two additional filters and one
settling tank at the Sewage Works.
The filter will be constructed somewhat similarly to the
present ones, the media being principally burnt ballast, obtained
by burning the excavated clay with the top layer of sand soil.
The additional settling tank will be six feet wider than those
already constructed.
These filters and tanks have long been needed. The provisional
sanction of the L.G.B. for a loan for this work has been
obtained, and the work is nearing an end.
The Engineer and Surveyor has had a portion of the land
used for sludge disposal laid out in lagoons, and the sludge is run
into these in turn.